YASKAWA YRC1000 Operator's Manual page 184

1 Spot Welding Application Using a Motor Gun
1.13 Other Functions Using a Motor Gun
Execution of Workpiece Thickness Monitoring

• Set the mode switch of programming pendant to the play
mode.
SUPPLE-
MENT • Cancel the thickness measure mode.
* Refer to How to Cancel Thickness Measure Mode .
If playback of a job is performed with the thickness measure mode
canceled, the workpiece thickness detected at each weld point is
compared with the value of "TH", "THA", and "THM" tag.
If the comparison result is not acceptable, the alarm "Thickness Error"
occurs.
The formula for comparison is as follow.
For THM tag:
[Acceptable Result]
TH - THM ≤ The detected thickness ≤ TH + THM
[Not-Acceptable Result]
TH - THM >The detected thickness
Or
The detected thickness > TH + THM
For THA tag:
[Acceptable Result]
TH - (TH  THA / 100) ≤ The detected thickness
TH + (TH  THA / 100)
[Not-Acceptable Result]
TH - (TH  THA / 100) > The detected thickness
Or
The detected thickness > TH + (TH  THA / 100)
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